Typewriter mechanism



July 9, 1935. R. ATTI TYPEWRITER MECHANISM Filed Sept. 22, 1932 3 Sheets-Sheet l INVENTOR Eel/pk A it 1' ATTORNEYS July 9, 1935. ATTI TYPEWRITER MECHANISM Filed Sept. 22, 1932 3 She'ets-Sheet 2 INVENTOR ATTORNEYS July 9, 1935. R. ATTI 2,007,516

TYPEWRITER MECHANISM Filed Sept. 22, 1932 3 Shee'ts-Sheet 3 INVENTCR ATTORNEYS Patented July 9, 1935 2 007 51 UNITED STATES PATENT OFFICE TYPEWBITER MECHANISM Ralph Attl, Union City, N. J., assignor to Claude ,1. Rice, New York, N. Y.

Application se tember 22, 1932, Serial No. 634,329

'1 Claims. (01. 197-30) This invention relates to typewriters and more n sh w ng he type carrier in advanced par i r y o a type action for noiseless typep i writers. It is more particularly an improve- Figure 3 is a detail side elevation showing the ment on the device shown in my prior Patent No. type bar in pri P i i n;

1,864,521, issued June 28, 1932, Y Figure 4 is a detail side elevation partly in 5 In the patent above referred to it was found section showing the platen in raised or cap printthat a noiseless pe action could be constructed h s po o r by the use of a certain actuating mechanism Figure 5 is a partial front elevation showing which would normally force the t e bar subth a nt o t sector carrying t e t p stantially into' position opposite the printing bars and taken Substantially on the 11119 10 point and then by a further movement of the of Fi e key, acam would be brought into operation which Fi urefi is a f nt l va i n part a y n s cwould then deflect the type bar to cause the t n s m ar t Fi u e 5 s win n f the exnoiseless printing. treme type carriers in typing position;

I ave also found it possible to bring about Figure 7 is anvenlarged vertical section of the 15 substantially noiseless operation by the use of a Printing 0 1m mechanism in -Pr n D so-called vector or arcuate movement of the type bar in which the type is brought into posi- Figure 8 is a similar view showing the cam in tion adjacent the printing pointand subsequentan advanced Printing p s t a 1y deflected for printing. Figure 9 is a transverse section on the line 9-9 20 It is one of the principal objects of this invenof Fi tion to provide a type actuation for noiselessly In my prior Pat I have d b d a o seprinting in which the type bar is moved in a less actuating rectilinear movement for a type vector or arcuate path and brought noiselessly r r w h h s v d i l r p rok 2 into printing position by the co-operation of a pr nti is m v m nt as p t d t cam mechanism. advance of the type to a position adjacent the Another object of the invention is to provide p a bu Short of P t n contact, and a Subside stroke printing in a noiseless type operation sequent movement of t e typ head into p in which the type bar is substantially stopped me p n. In my present invention I hav before printing contact and is subsequently given developed such noiseless actuation for embodi- 30 an additional movement for direct printing. ment in a vector or arcuate movement of the Another object of the invention is to provide a typ arri r w r by th ty h d m v s in noiseless type operation for typewriters in which an arcuate p h for printingthe type bars may be carried in the normal ar-' A preferred form of embodiment of my inrangement for vector movement and by an imvention includes a type bar carrier l0 which proved mechanism given an initial high accelmay be suitably pivoted On an axis ll unted eration and subsequent high velocity which is on the segment plate l2, which in turn is careifectively reduced to zero before contact and ried by t e frame 0f the machine The ype printing can be brought about by the interpobar I 6 is carried by the carrier l0 and is prefsition of a further cam mechanism. erably pivoted thereto as at the point l8. The 40 Another object of the invention is to provide typewriter will have suitable k ys 20 mounted a multi-part type bar carrier, mounted for moveon the key bars 22 which may be pivoted as at ment in the usual way but having additional cam 23. Intermediate the end, the key bars 22 are means so that on final actuation of the printing connected by links 24 to bell crank levers 25. One

key, the type bar carrier is given an additional arm 25a of each bell crank is linked by an inter- 45 movement to efiectuate printing. mediate link 21 to a second bell crank 28 which Further objects and advantages of my invenis pivoted at 29 at a spaced position from the tion will appear from the following description first bell crank 25. The second bell crank through thereof taken in connection with the attached its arm 28a, is linked by an actuating lever 30 to drawings which illustrate a preferred form of the type bar carrier I!) through the medium 01 5 embodiment of my invention and in which: the pivot 32.

Figure 1 is a side elevation of a typewriter The arrangement of links is such, that on dewith parts in section showing one form of the pression of the key 20, the bell crank 25 is rotated type actuating linkage; counter-clockwise and by means of the inter- Figure 2 is a similar side elevation partially mediate link 21, the bell crank 28 is likewise ro- 55 tated, but in a clockwise direction causing a movement of the type bar carrier l about its pivot H. The type bar carrier is moved extremely rapidly toward the platen 34, but inasmuch as the actuating lever 30 comes into a straight line relation with the bell crank arm'28a as shown in Figure 2, and as the pivot 29 for the bell crank 28 is a fixed distance from the platen the type bar IE will not contact with the paper and ribbon 31 on the platen 34. The type bar carrier carrying the type bar I6 is thus first accelerated into high velocity movement along an arcuate path with the center at H and then due to the making of the toggle by the bell crank arm 28a and the actuating arm 30, the velocity of the type bar is reduced to zero before the type bar can make any contact. This movement is therefore entirely noiseless.

Printing is effected by moving the type bar l6 carrying the type head 36 relatively to the type bar carrier Hi. This is accomplished by the cam 38 more clearly shown in Figure 7 which is preferably formed on the actuating arm 30 and cooperates with cam followers 39 and 39a on the type bar It. This relationship, however, could be modified or reversed if desired. The actuating link 30 is pivoted at 32 as before described to the end of the type bar carrier Ill. As the actuating arm 30 approaches the straight line position the cam track 38 contacts with the cam follower 39a thus relatively moving the type bar It with respect to the type bar carrier III. This cam relation is sufficient after proper movement of the actuating arm 30 to force the type 36a or 36b into contact with the ribbon and paper 31 for printing. The movement of the actuating member 30 through the straight line position is positively controlled by the movement of the key 20 so that pressure printing is possible.

The full advanced position of the type bar I6 is shown in Figure 8 and it will be noted that the cam follower 39 closely follows the cam to prevent any noisy operation or over-motion. Furthermore, as the actuating member 30 is returned due to the cooperation of the spring 42 and the action of gravity on the bell crank arm 28a, the cam'follower 39 will cooperate with other portions of the cam track 38 to forcibly return the type bar to its initial position with respect to the type bar carrier.

While any suitable construction may be used, the preferred construction of the cam and cam follower is shown in Figure 9 in which the cam 38 is enclosed between the sides of the type carrier l0 and a plate 40 to give a fully enclosed cam and prevent lateral movement of the respective parts.

Lower cap letters 36a may be effectively carried on the shorter radius and upper cap letters carried on the greater radius as shown in Figure 3. In normal operation therefore the actuating arm 30 will force the lower cap letters 36a into proper position against the platen 34 and for capitalization the platen is preferably moved to bring about the cooperation of the upper cap letters 361). While other methods of changing [the effective point of contact may be feasible, the movement of the platen is a simple manner for capitalization and introduces few complica tions in manufacture as well as operation.

As before mentioned, the spring 42 acts as a limit to the upward movement of the bellcrank arm 28a and cooperates to return the key 20 to its original position. An additional spring 43 placed under the key bar 22 may also be used to assist in this operation. It is to be understood that the bellcrank arm 28a and actuating member 30 need not actually pass beyond dead center position to effectuate printing, as printing depends on the shape and location of the cam track. The spring 42 is thus arranged accordingly. I

The segment plate [2 is normally adapted to carry all of the type carriers which are preferably pivoted along an arcuate line. Other supports are possible but this construction affords strength and simplicity of construction and is thus thought to be superior.

The type carrier is in a plane which passes through the printing point rather than being in a plane which passes through a point from of an inch to of an inch below the printing point as is common practice. The type head 45 is also provided with a tall 44 projecting below the type head and cooperating with the fixed guide 46. As is the usual practice the type head is at an angle with the type carrier which is supplementary to the angle that the type carrier makes with a perpendicular to the platen, but the carrier is then in a plane cutting the plane of the type head.

With such construction there is no unbalanced resultant of force as the type head comes directly into printing position and prints in the plane of movement. There is therefore no possibility of twisting of the type head. The tail piece 46 further balances the type head for uniform rapid printing.

It will thus be seen that the present typewriter will operate entirely noiselessly with the type carrier reciprocating in an arcuate path without objectionably affecting the standard key movement or pressure. The parts may be proportioned to enable printing with the same key movement and the typing can be done therefore in a noiseless and rapid fashion. Furthermore, as the intermediate link moves into a right angle relation with the respective bellcrank arms to which it is linked, high speed typing can be effected.

While I have shown a preferred form of embodiment of my invention I am aware that other modifications may be made therein, and I therefore desire a broad interpretation of my device within the scope and spirit of the description herein and of the claims appended hereinafter.

I claim:

1. A type bar action for noiseless typewriters comprising a type bar carrying a printing type, an oscillatable carrier on which said type bar is movably mounted, a fixed pivot for said carrier and means to carry the type bar to a projected position, including a key, a. plurality of links connected to said key and said carrier whereby on first movement of said key, said carrier is rotated about said pivot into projected position and stopped before contact, and a cam, actuated by the final movement of said key, to give said type bar an additional movement in the same direction in projected position to effect printing.

2. A type bar action for noiseless typewriters, comprising a type bar, a pivoted carrier carrying said type bar, a key, links connected to said key and said carrier to move said carrier to a projected position, and cam means carried by said carrier and cooperating with said type bar to force said type bar into printing position on a further movement of said key.

3. In a device of the character described, a type bar carrier pivotally mounted for oscillation,

type carrying means pivoted to said type bar carrier, a toggle, one arm of said toggle being connected to said type carrier, and linkage connected to said toggle, said linkage and toggle first rapidly moving said type bar carrier, and subsequently stopping the movement of said type bar carrier from rotation about its pivot and cam means carried by said type bar carrier holding said type carrying means from movement with respect to said type bar carrier during said first period and subsequently rotating said type carrying means about its pivot.

4. In a device of the character described, a frame, a bar mounted for oscillation upon said frame, a type head carried by said bar, an actuating means for moving said bar, said actuating means comprising a toggle joint, one member of said toggle joint being pivoted to said bar, said toggle member being provided with a type depressing cam, and a cam follower on said type head cooperating with said cam for moving said head relative to said bar to efiect printing.

5. In a device of the character described a key, a toggle lever, connections from said key to said toggle lever, a type carrier, a type bar mounted for movement on said carrier and type on said type bar, half of said toggle lever being a bell crank pivoted to a fixed pivot, the other half of said toggle lever being pivoted to said type carrier, and means whereby the movement of said toggle lever efiects two substantially separate movements of said type,

said toggle lever noiselessly stopping the movement of said type carrier prior to type contact and additionally reinstating the movement of the type in the same direction to effectuate printing.

6. In a device of the class described a type carrier pivoted to a fixed pivot, a type bar pivoted to said type carrier on a different axis, type on said bar, means for giving said type a vector movement about said pivot as a center point, comprising a key, a link, and a toggle lever connected to said link, a cam upon said toggle lever, and a cam follower upon said type bar, said cam and cam follower when brought into cooperative position giving said type a further vector movement about the different axis.

'7. In a device of the class described, a type bar, a pivot, means for giving said type bar a movement about said pivot, comprising key means, a bell crank, links between said bell crank and said key means, and an actuating member pivoted to said bell crank and in positive driving relation to said type bar, and means to give said type bar a separate movement including a cam, and a cam follower, one of said cam members being mounted on said type bar and the other cam member being mounted on said actuating member whereby a relative movement may be given the type bar with respect to the actuating member on positive additional movement of the key means.

RALPH Am. 

